Getting myself up to speed on MatLab for this fall’s classes, the activation fails on Snow Leopard with some ugly error message. Fix is easy — in the Java Preferences app on your system, make 32-bit Java the default. All is well after that.

Details on the “matlab support site”:http://www.mathworks.com/support/solutions/en/data/1-8GS5S1/index.html?product=ML&solution=1-8GS5S1